According to one estimate, as many as a third of Americans who have been on low-carb diets have quit for good. Many of these dieters, though, have come away with a better appreciation of nutrition and healthier eating habits (so don't rush out and buy stock in Krispy Kreme just yet). The real losers have been the food manufacturers who invested heavily in low-carb products -- products that are now gathering dust on store shelves.

Of course, the more important question now is, what will the next diet craze be?

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